Teach Computing

Revision notes, activities, lesson plans, teaching ideas, and other resources for GCSE, A-Level, and IB Computer Science teachers and students.

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CommandPoint CAD

CommandPoint by Northrop Grumman offers a range of CAD systems for various ...

CAD+911 System

TriTech Software Systems is a company that specialises in Computer Aided Di...

London Ambulance CAD failure

The 1992 London Ambulance Service CAD failure is probably the most notoriou...

Washington State 911 Failure

A 911 emergency telephone system in Washington State and Oregon shut down f...

London ambulance failure (2017)

A 2017 failure of a London ambulance dispatch system is believed to have le...

Computer Aided Dispatch outage

A 911 system failure left emergency calls unanswered and is said to have co...

Load balancing videos

This short article and the associated video explain 5 load balancing algori...

Intergraph Computer-Aided Dispatch (I/CAD

Intergraph Computer-Aided Dispatch (I/CAD) is a system offering many of the...

Boolean logic worksheet pack

These three Boolean logic worksheets have exam style questions on logic sta...

Resources discount offer

3.1 Advanced Theory Data representation

Click here for recommended Cambridge A-Level Computer Science textbooks.

3.1.1 User-defined data types

3.1.2 File organisation and access

3.1.3 Real numbers and normalised floating-point representation

Floating point numbers

Floating point numbers

A good explanation of why we use floating point numbers. Also covers their limitations as approximations, with good explanations of floating point rounding errors applied to real-life concepts such as currency and accounting.


Updated: 2015-06-03